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Systematic Lossy Forward Error Protection for Video Waveforms - PowerPoint PPT Presentation


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Systematic Lossy Forward Error Protection for Video Waveforms. Overview. Error Resilient Digital Video Broadcasting Systematic Lossy Forward Error Protection Embedded Wyner-Ziv Coding Improved Wyner-Ziv Video Codec. uplink. Satellite Broadcast. Terrestrial broadcast. Cable TV.

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Presentation Transcript
overview
Overview
  • Error Resilient Digital Video Broadcasting
  • Systematic Lossy Forward Error Protection
  • Embedded Wyner-Ziv Coding
  • Improved Wyner-Ziv Video Codec
slide3

uplink

Satellite Broadcast

Terrestrial broadcast

Cable TV

Error-Resilient Digital Video Broadcasting

  • Forward Error Correction (FEC)
    • “Cliff” effect
    • For graceful degradation, Priority Encoding Transmission (PET) [Albanese, et al., 1996]
    • Layered representation incurs a rate-distortion penalty
  • Forward Error Protection (FEP)
    • Protects the video waveform
    • Graceful degradation without layered representation
related work
Related Work
  • Bounds for systematic lossy source-channel coding

[Shamai, Verdu and Zamir, 1998]

Y

Channel A

uncoded

Side information

X

Encoder

Channel D

Decoder

X*

  • Enhancing analog transmission systems using digital side information [Pradhan and Ramchandran, 2001]
  • Robust predictive coding [Sehgal and Ahuja, 2003]
slide5

Side information

Slepian-Wolf Encoder

Turbo Encoder

Turbo Decoder

Slepian-Wolf Decoder

Reconstruction

Coarse Quantizer

Scalar Quantizer

S*

Wyner-Ziv Encoder

Wyner-Ziv Decoder

Systematic Lossy Forward Error Protection

  • Protects the original video waveform
  • “Lossy” protection

MPEG Encoder

MPEG Decoder with Error Concealment

S

S’

Error-Prone channel

results
Results

Carphone: CIF, 50 frames @ 30fps 1 Mbps, 1% macroblock loss

slide7

Wyner-Ziv Coding

(16 quantization levels, 0.75bpp)

Error Concealment only (No WZ bits)

Carphone: CIF, 1 Mbps, 1% macroblock loss

embedded wyner ziv codec

Wyner-Ziv

Encoder A

Wyner-Ziv

Decoder A

S*

Wyner-Ziv

Encoder B

Wyner-Ziv

Decoder B

S**

Embedded Wyner-Ziv Codec
  • Graceful degradation of video quality
  • Does not require layered representation

MPEG

Encoder

MPEG Decoder with Error Concealment

S

S’

Error-Prone channel

results 2 level wyner ziv codec
Results2-level Wyner-Ziv Codec

Carphone: CIF, 50 frames @ 30fps 1 Mbps, 1% macroblock loss

slide10

Systematic Lossy Forward Error Protection

MPEG Encoder

MPEG Decoder with Error Concealment

S

S’

Error-Prone channel

Slepian-Wolf Encoder

Slepian-Wolf Decoder

Reconstruction

Coarse Quantizer

S*

Wyner-Ziv Encoder

Wyner-Ziv Decoder

slide11

Fallback to coarse representation

MPEG Encoder

MPEG Decoder with Error Concealment

S

Common

reference

frame

MPEG

Decoder

MPEG

Encoder

MPEG

Encoder

S*

R-S

Decoder

R-S

Encoder

Parity symbols

Wyner-Ziv Encoder

Side

information

Wyner-Ziv Decoder

Improved Wyner-Ziv Coder

S’

Error-Prone channel

Common

reference

frame

[Rane, Aaron, Girod (submitted to VCIP ’04)]

slide12

Systematic Lossy FEP vs. FEC Foreman.cif

FEC

Main Stream @ 1.092 Mbps

FEC (n,k) = (40,36)

FEC bitrate = 120 Kbps

Total = 1.2 Mbps

Proposed Scheme

Main Stream @ 1.092 Mbps

WZ Stream @ 270 Kbps

FEP (n,k) = (52,36)

WZ bitrate = 120 Kbps

Total = 1.2 Mbps

slide13

1 Mbps + 120 kbps FEC

(33.03 db)

1 Mbps + 120 kbps FEP

(38.40 db)

Foreman: CIF, 50 frames, symbol error rate = 10-3

summary
Summary
  • A novel systematic lossy forward error protection scheme for error-resilient video broadcasting
  • Wyner-Ziv coding applied to forward error protection
  • Advantages
    • More robust than FEC over a wide range of error rates
    • Graceful degradation without layered video representation
    • Backward-compatible